复习ssm整合小demo

整合ssm
项目代码地址：https://gitee.com/chenfenbgin/ssmbuild

环境：

IDEA
MySQL 5.7.19
Tomcat 9
Maven 3.6

数据库环境

CREATE DATABASE `ssmbuild`;
USE `ssmbuild`;
DROP TABLE IF EXISTS `books`;


CREATE TABLE `books` (
`bookID` INT(10) NOT NULL AUTO_INCREMENT COMMENT '书id',
`bookName` VARCHAR(100) NOT NULL COMMENT '书名',
`bookCounts` INT(11) NOT NULL COMMENT '数量',
`detail` VARCHAR(200) NOT NULL COMMENT '描述',
KEY `bookID` (`bookID`)
) ENGINE=INNODB DEFAULT CHARSET=utf8


INSERT  INTO `books`(`bookID`,`bookName`,`bookCounts`,`detail`)VALUES 
(1,'Java',1,'从入门到放弃'),
(2,'MySQL',10,'从删库到跑路'),
(3,'Linux',5,'从进门到进牢');

基本环境搭建

1、新建一Maven项目！ssmbuild ，添加web的支持

2、导入相关的pom依赖！

<dependencies>
   <!--Junit-->
   <dependency>
       <groupId>junit</groupId>
       <artifactId>junit</artifactId>
       <version>4.12</version>
   </dependency>
   <!--数据库驱动-->
   <dependency>
       <groupId>mysql</groupId>
       <artifactId>mysql-connector-java</artifactId>
       <version>5.1.47</version>
   </dependency>
   <!-- 数据库连接池 -->
   <dependency>
       <groupId>com.mchange</groupId>
       <artifactId>c3p0</artifactId>
       <version>0.9.5.2</version>
   </dependency>
   <!--Servlet - JSP -->
   <dependency>
       <groupId>javax.servlet</groupId>
       <artifactId>servlet-api</artifactId>
       <version>2.5</version>
   </dependency>
   <dependency>
       <groupId>javax.servlet.jsp</groupId>
       <artifactId>jsp-api</artifactId>
       <version>2.2</version>
   </dependency>
   <dependency>
       <groupId>javax.servlet</groupId>
       <artifactId>jstl</artifactId>
       <version>1.2</version>
   </dependency>
   <!--Mybatis-->
   <dependency>
       <groupId>org.mybatis</groupId>
       <artifactId>mybatis</artifactId>
       <version>3.5.2</version>
   </dependency>
   <dependency>
       <groupId>org.mybatis</groupId>
       <artifactId>mybatis-spring</artifactId>
       <version>2.0.2</version>
   </dependency>
   <!--Spring-->
   <dependency>
       <groupId>org.springframework</groupId>
       <artifactId>spring-webmvc</artifactId>
       <version>5.1.9.RELEASE</version>
   </dependency>
   <dependency>
       <groupId>org.springframework</groupId>
       <artifactId>spring-jdbc</artifactId>
       <version>5.1.9.RELEASE</version>
   </dependency>
</dependencies>

3、Maven资源过滤设置

<!-- 静态资源导出问题   -->
<build>
   <resources>
       <resource>
           <directory>src/main/java</directory>
           <includes>
               <include>**/*.properties</include>
               <include>**/*.xml</include>
           </includes>
           <filtering>false</filtering>
       </resource>
       <resource>
           <directory>src/main/resources</directory>
           <includes>
               <include>**/*.properties</include>
               <include>**/*.xml</include>
           </includes>
           <filtering>false</filtering>
       </resource>
   </resources>
</build>

4、建立基本结构和配置框架！

com.fengbin.pojo
com.fengbin.dao
com.fengbin.service
com.fengbin.controller
mybatis-config.xml, mybatis核心配置文件

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE configuration
       PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
       "http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>
</configuration>

applicationContext.xml spring核心配置文件

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
      xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
      xsi:schemaLocation="http://www.springframework.org/schema/beans
       http://www.springframework.org/schema/beans/spring-beans.xsd">
</beans>

Mybatis层编写

1、数据库配置文件 resources/database.properties

jdbc.driver=com.mysql.jdbc.Driver
# 如果使用的是Mysql8.0+的版本，需要增加一个时区的配置 &serverTimezone=Asia/Shanghai
jdbc.url=jdbc:mysql://localhost:3306/ssmbuild?useSSL=true&useUnicode=true&characterEncoding=utf8
jdbc.username=root
jdbc.password=123456

2、IDEA关联数据库

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3、编写MyBatis的核心配置文件

  <?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE configuration
       PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
       "http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>
   <typeAliases>
       <package name="com.fengbin.pojo"/>
   </typeAliases>

</configuration>

4、编写数据库对应的实体类 com.fengbin.pojo.Books

使用lombok插件！

@Data
@AllArgsConstructor
@NoArgsConstructor
public class Books {

   private int bookID;
   private String bookName;
   private int bookCounts;
   private String detail;

}

5、编写Dao层的 Mapper接口！在com.fengbin.dao创建

public interface BookMapper {

   //增加一个书
   int addBook(Books book);

   //删除一个书
   int deleteBookById(@Param("bookID") int id);

   //更新一个书
   int updateBook(Books books);

   //查询一本书
   Books queryBookById(@Param("bookID") int id);

   //查询全部Book,返回list集合
   List<Books> queryAllBook();
}

6、编写接口对应的 Mapper.xml 文件。需要导入MyBatis的包；在resources/com/fengbin/dao/BookMapper.xml
编写前关联数据库，sql语句提示更加方便，如图：
在这里插入图片描述

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper
        PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<!-- 一个mapper对应一个接口-->
<mapper namespace="com.fengbin.dao.BookMapper">
    <!--增加一个Book-->
    <insert id="addBook" parameterType="Books">
        insert into ssmbuild.books(bookName, bookCounts, detail)
        values (#{bookName}, #{bookCount}, #{detail});
    </insert>

    <delete id="deleteBookById" parameterType="int">
        delete from ssmbuild.books where bookID = #{bookID}
    </delete>

    <update id="updateBook" parameterType="Books">
        update ssmbuild.books
        set bookName = #{bookName},
            bookCounts = #{bookCounts},
            detail = #{detail}
        where bookID = #{bookID};
    </update>

    <select id="queryBookById" resultType="Books" parameterType="int">
        select *
        from ssmbuild.books
        where bookID = #{bookID};
    </select>

    <select id="queryAllBook" resultType="Books">
        select *
        from ssmbuild.books;
    </select>
</mapper>

7、编写Service层的接口和实现类
service的接口BookService：

//BookService:底下需要去实现,调用dao层
public interface BookService {

   //增加一个书
   int addBook(Books book);

   //删除一个书
   int deleteBookById(int id);

   //更新一个书
   int updateBook(Books books);

   //查询一本书
   Books queryBookById(int id);

   //查询全部Book,返回list集合
   List<Books> queryAllBook();
}

service的接口的实现类，BookServiceImpl：

public class BookServiceImpl implements BookService {

    //调用dao层的操作，先来设置一个set接口，方便Spring管理
    private BookMapper bookMapper;
    public void setBookMapper(BookMapper bookMapper){
        this.bookMapper = bookMapper;
    }

    @Override
    public int addBook(Books book) {
        return bookMapper.addBook(book);
    }

    @Override
    public int deleteBookById(int id) {
        return bookMapper.deleteBookById(id);
    }

    @Override
    public int updateBook(Books books) {
        return bookMapper.updateBook(books);
    }

    @Override
    public Books queryBookById(int id) {
        return bookMapper.queryBookById(id);
    }

    @Override
    public List<Books> queryAllBook() {
        return bookMapper.queryAllBook();
    }
}

Spring层

1、配置Spring整合MyBatis，我们这里数据源使用c3p0连接池；
2、我们去编写Spring整合Mybatis的相关的配置文件；spring-dao.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:context="http://www.springframework.org/schema/context"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
       http://www.springframework.org/schema/beans/spring-beans.xsd
       http://www.springframework.org/schema/context
       https://www.springframework.org/schema/context/spring-context.xsd">

    <!-- 配置整合mybatis -->
    <!-- 第一步1.关联数据库文件, 这样这个数据库配置文件，就可以通过spring来读了，以前我们是通过mybatis-->
    <context:property-placeholder location="classpath:database.properties"/>

    <!-- 第二步2.数据库连接池 -->
    <!--数据库连接池
        dbcp 半自动化操作 不能自动连接
        c3p0 自动化操作（自动的加载配置文件 并且设置到对象里面）
        druid
    -->
    <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
        <!-- 配置连接池属性 -->
        <property name="driverClass" value="${jdbc.driver}"/>
        <property name="jdbcUrl" value="${jdbc.url}"/>
        <property name="user" value="${jdbc.username}"/>
        <property name="password" value="${jdbc.password}"/>

        <!-- c3p0连接池的私有属性 -->
        <property name="maxPoolSize" value="30"/>
        <property name="minPoolSize" value="10"/>
        <!-- 关闭连接后不自动commit -->
        <property name="autoCommitOnClose" value="false"/>
        <!-- 获取连接超时时间 -->
        <property name="checkoutTimeout" value="10000"/>
        <!-- 当获取连接失败重试次数 -->
        <property name="acquireRetryAttempts" value="2"/>
    </bean>

    <!-- 第三步3.配置SqlSessionFactory对象 -->
    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        <!-- 注入数据库连接池 -->
        <property name="dataSource" ref="dataSource"/>
        <!-- 绑定mybatis的配置文件，配置MyBaties全局配置文件:mybatis-config.xml -->
        <property name="configLocation" value="classpath:mybatis-config.xml"/>
    </bean>

    <!-- 第四步4.配置扫描Dao接口包，动态实现Dao接口注入到spring容器中
                我们原来是手动配置，需要写一个实现类，比如我们在dao下建一个BookMapperImpl-->
    <!--解释 ：https://www.cnblogs.com/jpfss/p/7799806.html-->
    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        <!-- 注入sqlSessionFactory -->
        <property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"/>
        <!-- 给出需要扫描Dao接口包 -->
        <property name="basePackage" value="com.fengbin.dao"/>
    </bean>
</beans>

3、Spring整合service层

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
      xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
      xmlns:context="http://www.springframework.org/schema/context"
      xsi:schemaLocation="http://www.springframework.org/schema/beans
   http://www.springframework.org/schema/beans/spring-beans.xsd
   http://www.springframework.org/schema/context
   http://www.springframework.org/schema/context/spring-context.xsd">
   <!-- 扫描service相关的bean -->
   <context:component-scan base-package="com.chen.service" />
   <!--BookServiceImpl注入到IOC容器中-->
   <bean id="BookServiceImpl" class="com.chen.service.BookServiceImpl">
       <property name="bookMapper" ref="bookMapper"/>
   </bean>
   <!-- 配置事务管理器 -->
   <bean id="transactionManager"class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
       <!-- 注入数据库连接池 -->
       <property name="dataSource" ref="dataSource" />
   </bean>
</beans>

SpringMVC层

1、web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
        xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd"
        version="4.0">
   <!--DispatcherServlet-->
   <servlet>
       <servlet-name>DispatcherServlet</servlet-name>
       <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
       <init-param>
           <param-name>contextConfigLocation</param-name>
           <!--一定要注意:我们这里加载的是总的配置文件，之前被这里坑了！-->  
           <param-value>classpath:applicationContext.xml</param-value>
       </init-param>
       <load-on-startup>1</load-on-startup>
   </servlet>
   <servlet-mapping>
       <servlet-name>DispatcherServlet</servlet-name>
       <url-pattern>/</url-pattern>
   </servlet-mapping>
   <!--encodingFilter-->
   <filter>
       <filter-name>encodingFilter</filter-name>
       <filter-class>
          org.springframework.web.filter.CharacterEncodingFilter
       </filter-class>
       <init-param>
           <param-name>encoding</param-name>
           <param-value>utf-8</param-value>
       </init-param>
   </filter>
   <filter-mapping>
       <filter-name>encodingFilter</filter-name>
       <url-pattern>/*</url-pattern>
   </filter-mapping>
   <!--Session过期时间-->
   <session-config>
       <session-timeout>15</session-timeout>
   </session-config>
</web-app>

2、spring-mvc.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:context="http://www.springframework.org/schema/context"
       xmlns:mvc="http://www.springframework.org/schema/mvc"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
   http://www.springframework.org/schema/beans/spring-beans.xsd
   http://www.springframework.org/schema/context
   http://www.springframework.org/schema/context/spring-context.xsd
   http://www.springframework.org/schema/mvc
   https://www.springframework.org/schema/mvc/spring-mvc.xsd">
    <!-- 配置SpringMVC -->
    <!-- 1.开启SpringMVC注解驱动 -->
    <mvc:annotation-driven />
    
    <!-- 2.静态资源默认servlet配置-->
    <mvc:default-servlet-handler/>
    
    <!-- 3.配置jsp 显示ViewResolver视图解析器 -->
        <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="viewClass" value="org.springframework.web.servlet.view.JstlView" />
        <property name="prefix" value="/WEB-INF/jsp/" />
        <property name="suffix" value=".jsp" />
    </bean>
    
    <!-- 4.扫描web相关的bean -->
    <context:component-scan base-package="com.fengbin.controller" />

</beans>

3、Spring配置整合文件，applicationContext.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
      xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
      xsi:schemaLocation="http://www.springframework.org/schema/beans
       http://www.springframework.org/schema/beans/spring-beans.xsd">
   <import resource="spring-dao.xml"/>
   <import resource="spring-service.xml"/>
   <import resource="spring-mvc.xml"/>
</beans>

配置文件，暂时结束！Controller 和视图层编写

1、BookController 类编写，方法一：查询全部书籍

@Controller
@RequestMapping("/book")
public class BookController {
   @Autowired
   @Qualifier("BookServiceImpl")
   private BookService bookService;
   @RequestMapping("/allBook")
   public String list(Model model) {
       List<Books> list = bookService.queryAllBook();
       model.addAttribute("list", list);
       return "allBook";
  }
}

2、编写首页 index.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"pageEncoding="UTF-8" %>
<!DOCTYPE HTML>
<html>
<head>
   <title>首页</title>
   <style type="text/css">
       a {
           text-decoration: none;
           color: black;
           font-size: 18px;
      }
       h3 {
           width: 180px;
           height: 38px;
           margin: 100px auto;
           text-align: center;
           line-height: 38px;
           background: deepskyblue;
           border-radius: 4px;
      }
   </style>
</head>
<body>
<h3>
   <a href="${pageContext.request.contextPath}/book/allBook">点击进入列表页</a>
</h3>
</body>
</html>

3、书籍列表页面 allbook.jsp

<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>书籍列表</title>
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <!-- 引入 Bootstrap，引入在线的就行-->
    <link href="https://cdn.bootcss.com/bootstrap/3.3.7/css/bootstrap.min.css"rel="stylesheet">
</head>
<body>
<%-- 栅格系统--%>
<div class="container">
    <div class="row clearfix">
        <div class="col-md-12 column">
            <div class="page-header">
                <h1>
                    <small>书籍列表 —— 显示所有书籍</small>
                </h1>
            </div>
        </div>
    </div>
    <div class="row">
        <div class="col-md-4 column">
            <a class="btn btn-primary"href="${pageContext.request.contextPath}/book/toAddBook">新增</a>
        </div>
    </div>

    <div class="row clearfix">
        <div class="col-md-12 column">
            <table class="table table-hover table-striped">
                <thead>
                <tr>
                    <th>书籍编号</th>
                    <th>书籍名字</th>
                    <th>书籍数量</th>
                    <th>书籍详情</th>
                    <th>操作</th>
                </tr>
                </thead>
                <tbody>
                <%-- 书籍从数据库中查询出来，Model里面的list,遍历出来，使用foreach
                         list可以直接从使用 items = "${list}"取出来，也可以从requsetScope.get("list")--%>
                <c:forEach var="book" items="${requestScope.get('list')}">
                    <tr>
                        <td>${book.getBookID()}</td>
                        <td>${book.getBookName()}</td>
                        <td>${book.getBookCounts()}</td>
                        <td>${book.getDetail()}</td>
                        <td>
                            <a href="${pageContext.request.contextPath}/book/toUpdateBook?id=${book.getBookID()}">更改</a> |
                            <a href="${pageContext.request.contextPath}/book/del/${book.getBookID()}">删除</a>
                        </td>
                    </tr>
                </c:forEach>
                </tbody>
            </table>
        </div>
    </div>
</div>

4、BookController 类编写，方法二：添加书籍

@RequestMapping("/toAddBook")
public String toAddPaper() {
   return "addBook";
}
@RequestMapping("/addBook")
public String addPaper(Books books) {
   System.out.println(books);
   bookService.addBook(books);
   return "redirect:/book/allBook";
}

5、添加书籍页面：addBook.jsp

<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
   <title>新增书籍</title>
   <meta name="viewport" content="width=device-width, initial-scale=1.0">
   <!-- 引入 Bootstrap -->
   <link href="https://cdn.bootcss.com/bootstrap/3.3.7/css/bootstrap.min.css"rel="stylesheet">
</head>
<body>
<div class="container">
   <div class="row clearfix">
       <div class="col-md-12 column">
           <div class="page-header">
               <h1>
                   <small>新增书籍</small>
               </h1>
           </div>
       </div>
   </div>
   <form action="${pageContext.request.contextPath}/book/addBook"method="post">
      书籍名称：<input type="text" name="bookName"><br><br><br>
      书籍数量：<input type="text" name="bookCounts"><br><br><br>
      书籍详情：<input type="text" name="detail"><br><br><br>
       <input type="submit" value="添加">
   </form>
</div>

6、BookController 类编写，方法三：修改书籍

@RequestMapping("/toUpdateBook")
public String toUpdateBook(Model model, int id) {
   Books books = bookService.queryBookById(id);
   System.out.println(books);
   model.addAttribute("book",books );
   return "updateBook";
}
@RequestMapping("/updateBook")
public String updateBook(Model model, Books book) {
   System.out.println(book);
   bookService.updateBook(book);
   Books books = bookService.queryBookById(book.getBookID());
   model.addAttribute("books", books);
   return "redirect:/book/allBook";
}

7、修改书籍页面 updateBook.jsp

<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
   <title>修改信息</title>
   <meta name="viewport" content="width=device-width, initial-scale=1.0">
   <!-- 引入 Bootstrap -->
   <link href="https://cdn.bootcss.com/bootstrap/3.3.7/css/bootstrap.min.css"rel="stylesheet">
</head>
<body>
<div class="container">
   <div class="row clearfix">
       <div class="col-md-12 column">
           <div class="page-header">
               <h1>
                   <small>修改信息</small>
               </h1>
           </div>
       </div>
   </div>
   <form action="${pageContext.request.contextPath}/book/updateBook"method="post">
       <input type="hidden" name="bookID" value="${book.getBookID()}"/>
      书籍名称：<input type="text" name="bookName"value="${book.getBookName()}"/>
      书籍数量：<input type="text" name="bookCounts"value="${book.getBookCounts()}"/>
      书籍详情：<input type="text" name="detail" value="${book.getDetail() }"/>
       <input type="submit" value="提交"/>
   </form>
</div>

8、BookController 类编写，方法四：删除书籍

@RequestMapping("/del/{bookId}")
public String deleteBook(@PathVariable("bookId") int id) {
   bookService.deleteBookById(id);
   return "redirect:/book/allBook";
}

配置Tomcat，进行运行！

到目前为止，这个SSM项目整合已经完全的OK了

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